Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenue:
Product	$ 22,758	$ 26,871	$ 71,474	$ 64,316
Support and maintenance	9,014	7,046	25,519	20,033
Total revenue	31,772	33,917	96,993	84,349
Cost of revenue:
Product	9,757	8,953	30,136	22,049
Support and maintenance	3,095	2,424	9,816	7,064
Total cost of revenue	12,852	11,377	39,952	29,113
Gross Profit:
Product	13,001	17,918	41,338	42,267
Support and maintenance	5,919	4,622	15,703	12,969
Total gross profit	18,920	22,540	57,041	55,236
Operating expenses:
Research and development	17,287	13,227	55,290	39,875
Sales and marketing	28,435	27,862	88,484	77,324
General and administrative	8,061	3,955	26,564	14,541
Restructuring charges	890	0	890	0
Total operating expenses	54,673	45,044	171,228	131,740
Loss from operations	(35,753)	(22,504)	(114,187)	(76,504)
Other expense, net:
Interest expense	(2,170)	(1,231)	(6,242)	(4,044)
Other income, net	130	54	585	735
Total other expense, net	(2,040)	(1,177)	(5,657)	(3,309)
Loss before provision for income taxes	(37,793)	(23,681)	(119,844)	(79,813)
Provision for income taxes	132	89	428	440
Net loss	(37,925)	(23,770)	(120,272)	(80,253)
Deemed dividend to Series E and E-1 Convertible Preferred Stock	0	0	(6,588)	0
Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock	0	0	26,336	0
Net loss attributable to common stockholders	$ (37,925)	$ (23,770)	$ (100,524)	$ (80,253)
Net loss per share attributable to common stockholders— basic and diluted	$ (1.21)	$ (6.87)	$ (6.33)	$ (23.52)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted	31,291,513	3,459,860	15,873,071	3,412,447